Magnetic properties of [Ni_97at.%-W_3at.%] _100-x-Cu_x textured substrates for coated conductors

The degree of ferromagnetism of Ni-W_y alloys decreases as W-content y increases. Both the saturation magnetization M_sat at and Curie temperature T_c decrease linearly with W-content y, and both M_sat and T_c go to zero at critical concentration of y _c ∼ 9.50 at.% W. To compare with Ni-W alloys, the magnetic properties of a series of both as-rolled (non-textured) and annealed (biaxially textured) [Ni_97at.%W_3at.%]_100-xCu_x alloy tapes with compositions x = 0, 1, 3, 5, and 7 at.%, were studied. Characterization methods included XRD analyses to investigate the biaxial texturing of the annealed [Ni-W]-Cu alloy tapes and studies of the magnetization M for both as-rolled and annealed [Ni-W]-Cu alloy tapes. Both the isothermal mass magnetizations M(H) of a series of samples at different fixed temperatures and M(T) in fixed field, were measured. The effect of Cu addition on both the saturation magnetization M_sat and Curie temperature T_c of the Ni_97at.%W_3at.% alloy was investigated.